Rock-drill cylinder-head.



No. 66!,684. Patented Nov. I3, 1900.

.A. BALL 8:. T. OFFICER.

ROCK DRILL CYLINDER HEAD. (A limon filed June 20 1899.)

(No Model.)

Uirnn STATES i Fries.

ATENT ALBERT BALL AND THOMAS OFFICERJOF CLAREMONT, NENV HAMPSHIRE,ASSIGNORS TO THE SULLIVAN MACHINERY COMPANY, OF SAME PLACE AND CHICAGO,ILLINOIS;

ROCK-DRILL CYLINDER-HEAD.

SPECIFIGATIN fo1-ming part of Letters Patent N 0. 661,684, datedNovember 13, 1900.

Application filed June 20,1899.

To all whom it may concern.-

Be it known that we, ALBERT BALL and THOMAS OFFICER, residents ofClaremont, in the county of Sullivan and State of New Hampshire, haveinvented a new and useful Improvement in Rock-Drill Cylinder-Heads; andwe do hereby declare the following to be a full, clear, and exactdescription thereof.

Our invention relates to cylinder-heads for rock-drill and likemachines.

The main object of our invention is to pro vide a cylinder-head in whichthe packing is securely held in place and yet readily inspected whendesired or entirely removed without inconvenience.

To these ends our invention comprises the novel features hereinafter setforth and claimed. v

To enable others skilled in the art to make and use our invention, wewill describe the same more fully, reforring to the accompanyingdrawings, in which Figure 1 is a longitudinal section of a portion ofthe lower end of a cylinder of a suitable rock-drill with our inventionapplied thereto. Fig. 2 is an end view of the same. Fig. 3 is a sectionon the line 3 3, Fig. 2. Fig. 4 is a view of the retaining-bolt forsecuring the bushing in place.

Like letters of reference indicate like parts in each of the views.

The letter Ct designates the lower end of the cylinder of a suitablerock-drill having the lugs I), through which the'rods 01 pass, whichsecure the cylinder head or shell e to said cylinder. Accordingly saidcylinderhead 6 has the lugs e, corresponding to the lugs b and throughwhich the rods d pass.

The inner face of the shell 9 is threaded, as at 6 A 'partible gland orbushing f has the threads 9, adapted to engage the threaded portion 6 ofthe shell 6. The two parts of the gland or bushingf are secured togetherat the lower ends by dowel-pins, which pass 45 through openings h. Inorder to retain the gland f securely in position, we employ the bolt t'.This bolt i fits within the opening it in the shell e, and the said bolthas the oblong head t", which is slightly curved, as at 5o 7?, tocorrespond with the curve of the exte- Serial No. 721,215. (No model.)

jrior surface of the gland f. The opposite end of the bolt t'isthreaded, and a nut 1n engages therewith.

The said bolt t' acts on the principle of a wedge, for when said bolt isin place, with its curved portion engaging the curved surface of thestuffing-boxf,tl1e screw ing up of the nut on will draw said bolttighter around said gland and bind or look it securely in place. It isapparent that instead of having the curved portion 7? of the bolt t'smooth to conform to the smooth portion of the gland f said curvedportion 0? may be threaded, so as to engage the threads on said gland.In this case the threaded portion of said gland would be increased.

An ordinary spring nut-lock washer n is interposed between the nutm andthe shell e to prevent the unscrewing of said nut due to the vibrationof the machine when in op eration. A supplemental bushing 0 is containedwithin the shell (2, said bushing being also made in two parts connectedby ordinary dowel-pins passing through openings 0. The annular flange 0of the bushing 0 engages the shoulder r within the shell e,whereby theupward movement of the bushing'o is controlled.

The lower end of the bushing 0 is beveled or countersunk, as at 8, whilethe gland f has the beveled shoulders. The packingwhether compressibleor one of the compositions of metals used for this purpose, isinterposed between the beveled end 8 of the bushing 0 and the beveledshoulder s of the gland f. As the bushingf is screwed up into the shell6 the packing is compressed. This compression can always be maintainedby screwing up the glandffrom time to time; but when the upper endofsaid gland comes in contact with the flange 0 of the bushing 0 thenthe packing must be renewed.

As the glandf is made in two parts, it can be readily adjusted aroundthe piston-rod 25, and when it is desired to remove the packing orinspect the same it is only necessary. to unscrew the glandfand withdrawit from the shell e, together with the packing contained within saidgland. By removing onehalf of the gland the packing is then exposed andmay be turned on the piston-rod to present all points for inspection tosee if it is free from foreign substances. This is of special importancewhere steam is used as the motive power, and this invention isespecially adapted for such use, although we do not wish to limit it toany specific use.

At the upper end of the shell e is the upper bushingu, which restsagainst the shoulderu in said shell. The upper portion of the bushinguextends into the cylinder at, and said bushing has the Babbitt lining11, which presents a smooth .even surface to the piston-rod.

Suitable packing u may be interposed between the shoulder v on thebushing u and thelower end of the cylinder. This construction is claimedin a separate application filed by us of even date herewith,Serial No.721,214.

What we claim as our invention, and desire to secure by Letters Patent,1s-

1. In a cylinder-head for rock-drills, a bushing contained within theshell of said head, a partible gland extendinginto the shell and overthe bushing, said gland having a shoulder between which and the end ofthe bushing the packing is interposed, and means for adjustably securingthe gland in the shell of the head.

2 In a cylinder-head for rock-drills, said head comprising a shellprovided with interior screw-threads, a bushing contained withintheshell, a partible gland extending into the shell and over thebushing, said gland having exterior screw-threads for engaging theinteriorscrew-threads of the shell and an internal shoulder betweenwhich and the end of the bushing the packing is interposed.

3. In a cylinder-head for rock-drills, said head comprising a shellprovided with inte- BALL and THOMAS OFFICER, have hereunto 50 set ourhands.

ALBERT BALL.

THOMAS OFFICER. Witnesses:

GEO. E. WOLCOTT, JOHN H. OOssITT.

